Inishmore Lighthouse, Lighthouse from National Inventory of Architectural Heritage in County Galway, Ireland

Inishmore Lighthouse, also called Dún Árann Lighthouse, is a decommissioned white tower built inland at the middle of Inishmore, next to a Napoleonic-era signal tower and near the ring fort of Dún Eochla. It stands on a hill 122 metres above sea level, and the National Inventory of Architectural Heritage notes that it dominates views in the middle of Árainn.

Built in 1818, it served as the first lighthouse on the Aran Islands to warn ships of rocks below. Operations there ceased in 1857 when new lighthouses were completed on Inisheer and Eeragh to handle navigation duties instead.

The lighthouse is part of the maritime heritage of the largest Aran Island, where ancient stone forts and religious sites also stand as witnesses to island life. Together, these structures tell the story of how isolated communities shaped their identity through connection to the sea.

The tower stands inland at the island's midpoint, beside a Napoleonic-era signal tower, with the ring fort of Dún Eochla nearby. Visitors have found the compound and tower open. The site is reached by walking from the ferry landing at Kilronan or Killeany; no road leads directly to the tower.

The tower's inland site, at the island's midpoint, is unusual for a lighthouse; the National Inventory of Architectural Heritage notes it "dominates views in the middle of Árainn". It stands beside a Napoleonic-era signal tower, with the ring fort of Dún Eochla nearby, and visitors have found the compound and tower open.